Abstract: A vehicle has a main and an auxiliary air conditioning system. The main system includes a main compressor driven by the main vehicle engine, a main condenser, a main evaporator, and a main fan for discharging air through the main evaporator into a driver area of the vehicle. A secondary evaporator is located in a cabinet in an additional area of the vehicle and is connected with the main compressor for receiving first refrigerant simultaneously with the main evaporator. An auxiliary air conditioning system is in the cabinet and includes an AC powered auxiliary compressor, an auxiliary condenser and an auxiliary evaporator. An on board auxiliary power provider is driven by an auxiliary engine to supply AC power to the auxiliary compressor. An additional area fan moves air through the auxiliary and secondary evaporators into the duct.

Abstract: A truck includes an auxiliary power unit having components specifically selected such that they form a stand-alone unit that can fit within an auxiliary compartment of a vehicle and deliver heating, cooling, and additional electric power to the vehicle. Included is an auxiliary engine, an auxiliary alternator, and an auxiliary condenser to provide coolant for a personnel compartment mounted evaporator. An auxiliary voltage regulator provides a ramp-up feature to minimize excessive start-up loads, limits maximum available current from the auxiliary alternator when the auxiliary compressor is engaged, and selectively disables power to electrical components in the event of low vehicle battery voltage. The auxiliary engine includes a radiator system to provide heated fluid for a personnel compartment mounted heat exchanger.

Abstract: A hybrid auxiliary power system for a vehicle provides auxiliary electrical power, cooling, and heating while the main engine of the vehicle is turned off. An auxiliary engine directly drives an air-conditioner compressor. A condenser condenses the refrigerant and supplies it to an evaporator. A blower moves air through the evaporator and into the vehicle. The engine also drives an AC generator, which supplies air to a battery charger. The battery charger supplies DC voltage to charge the battery of the vehicle as well as power to the blower of the auxiliary air-conditioner.

Abstract: A heating and air-conditioning system has an auxiliary engine for heating and cooling of a vehicle while the primary engine of the vehicle is not operating. The vehicle has a sleeper compartment with a sleeper compartment air conditioning unit powered by the main engine. An auxiliary air conditioning system located exterior of the sleeper compartment is powered by the auxiliary engine. An auxiliary supply duct extends into the sleeper compartment and joins the duct of the sleeper compartment air conditioning unit. A valve operated by air pressure blocks air flow from the sleeper compartment air conditioning unit into the auxiliary duct while in the main position. In the auxiliary position, the valve blocks air flow from the auxiliary duct into the sleeper compartment air conditioning unit.

Abstract: An air conditioning system is disclosed employing a common plenum in which an evaporator airflow passage is formed through an inner side wall and out through a top wall and a condenser airflow passage is formed through a bottom wall and out through an outer side wall. Dual stage operation is provided by a pair of evaporator coils which are interleaved about a common evaporator core, and by a pair of condenser coils which are interleaved about a common condenser core.

Abstract: The components of a compact, dual stage air conditioning system are assembled within a common housing in which an evaporator airflow passage is separated from a condenser airflow passage by an interior panel. Dual stage operation is provided by a pair of evaporator coils which are interleaved about a common evaporator core, and by a pair of condenser coils which are interleaved about a common condenser core. A control circuit automatically enables single stage operation when on-board generator power is applied, and automatically enables dual stage operation for increased cooling capacity when commercial utility power is available.